A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20 kW.
(a) Determine the net power required to operate the heat pump, in kW.
(b) Evaluating electricity at $0.08 per determine the cost of electricity in a month when the heat pump operates for 200 hours.
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A household refrigerator with a coefficient of performance of 2.4 removes energy from the refrigerated space at a rate of 600 Btu/h. Evaluating electricity at $0.08 per determine the cost of electricity in a month when the refrigerator operates for 360 hours.